Acta Metallurgica Sinica (English Letters) ›› 2019, Vol. 32 ›› Issue (12): 1490-1500.DOI: 10.1007/s40195-019-00918-y

Special Issue: 2019年复合材料专辑

• Orginal Article • Previous Articles     Next Articles

Oxidation Performance and Interdiffusion Behavior of a Pt-Modified Aluminide Coating with Pre-deposition of Ni

He Liu1,2, Shuai Li1,2, Cheng-Yang Jiang3, Chun-Tang Yu1,2, Ze-Bin Bao1(), Sheng-Long Zhu1, Fu-Hui Wang3   

  1. 1 Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
    2 School of Materials Science and Engineering, University of Science and Technology of China, Shenyang 110016, China
    3 Shenyang National Laboratory for Materials Science,Northeastern University, Shenyang 110819, China
  • Received:2019-03-07 Revised:2019-04-26 Online:2019-12-10 Published:2019-11-25

Abstract:

To refrain the interdiffusion of elements while holding good oxidation resistance, a (Ni,Pt)Al/Ni composite coating was prepared by sequential treatments of electroplating Ni and Pt and successive gaseous aluminization. In comparison with normal (Ni,Pt)Al coating, high-temperature performance of the composite coating was evaluated in isothermal oxidation test at 1100 °C. Both the two coatings exhibited good resistance against high-temperature oxidation, but the interdiffusion of elements between composite coating and single-crystal (SC) superalloy substrate was greatly relieved, in which the thickness of secondary reaction zone (SRZ) and the amount of precipitated topologically close-packed phase in the SC alloy matrix were significantly decreased. Mechanisms responsible for delaying rate of coating degradation and SRZ growth/propagation are discussed.

Key words: Aluminide coating, Oxidation, Interdiffusion, Microstructure